Grinding-machine.



J. 11. HEALD.

GRINDING MACHINE.

APPLIOATION FILED MAY 26, 1908.

Patented 01111211911.

3 SHEETSSHEET 1.

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- llt forney J. N. HEALD.

GRINDING MACHINE.

APPLICATION FILED MAY 26, 1908.

Patented Oct. 24, 191 1.

3 SHEETS-SHEET 2.

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GRINDING MACHINE.

APPLICATION FILED MAY 26, 1908.

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UNITED STATES PATENT OFFICE.

JAMES N. HEALD, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO THE HEALD MACHINE COMPANY, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

GRINDING-MACHIN E.

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Specification of Letters Patent.

Patented Oct. 24, 1911.

To all whom it may concern.

Be it known that 1, JAMES N. HEALD, a citizen of the United States, residing at Worcester, in the county of Worcester and Commonwealth of Massachusetts, have invented a new and useful Improvement in Grinding-Machines, of which the following is a specification, accompanied by drawings forming a part of the same, in which Figure 1 is a top view of my improved grinding machine. Fig. 2 is an end view of the same, partly in section. front elevation. Fig. 4 is a view on an enlarged scale and partly in section of the feeding mechanism for one of the grinders. 1F ig. 5 is a horizontal section showing in detail portions of the grinder feeding mechanism.

Siiniiar reference letters and figures refer to similar parts in the different views.

My invention relates to a grinding machine arranged to grind simultaneously surfaces at angle-s to each other, such as the interior curved surface of a hollow cylinder and one end thereof by separate grinders,

comprising an improved arrangement of the means for reciprocating the grinders both with relation to each other and with relation to the work holding means, and it consists in the construction and arrangement of parts as hereinafter described and pointed out in the annexed claims.

Referring to the accompanying drawings 1 denotes the supporting base of the grinder to which are attached vertical plates 2, connected at the top by a transverse support forming a bridge 3, upon which are mounted journal bearings 4 for a shaft 5, having a pulley 6, driven from any convenient source of power, not shown, and carrying upon one end a work holding chuck 7 of any desired pattern, in the present instance provided with radially moving jaws to hold the cylinder 8, which is rotated while its surfaces a and b are being ground.

A table 9 is arranged to be reciprocated on ways 10 in a line parallel with the axis of the work holding chuck. Supported on the table 9 is table 11 having journal bearings 12 for a grinder spindle 13, carrying on its table 9, engaged by a pinion 16 on the V91,

Fig. 3 is a' tical shaft 17, having a suitable clutch connection 18 with a worm gear 19, engaging a worm 20 on a horizontal shaft 21. The shaft 21 is driven by-a bevel gear 22 in engagement with bevel pinions 23, 23, and arranged to be driven in opposite directions by the alternate attachment of the pinions 23 with a shaft 24, driven, through the usual arrangement of clutches, by change gears 25 and a pulley 26, connected with any convenient source of power, not shown. The bevel pinions 23, 23, are connected alternately to the shaft 24 by a sliding clutch 27 operated by dogs 28 in the well known man ner.

The above described method of reciprocating a table is similar to that in common use and forms no part of my invention. The usual means are also provided whereby a reciprocating movement may be given to the table by a hand wheel 28, if desired. This reciprocating movement of the table 9, carrying. the grinder 14, is arranged to move the grinder back and forth over the surface to be ground, with the end of the table 9 itself passing under the bridge 3. The grinder 14 is rotated by the pulley 13 and, in combination with the rotary movement imparted to the work itself, is arranged to grind the surface. a of a cylinder when brought into contact therewith by feeding mechanism, now to be described.

As shown by broken lines in Fig. 4, a rock shaft 29 is journaled in the reciprocating table 9, having two depending arms 30 and 31, one of which, 30, is arranged to be rocked in the usual manner by dogs 32 adjustably held on a bar 32*, thereby rocking the shaft 29 and swinging the other arm 31 which carries a friction roll 31, arranged to engage the sides of a. V-shaped notch in a pivoted lever 33, thereby rocking the lever 33 and operating a pawl and ratchet mechanism to turn a screw 34, which engages a nut 35 upon the table 11 to move it outward. The table 11 carries the grinding wheel 14, which is thereby intermittently fed toward the surface to be ground. A hand wheel 36 is pro- .vided by which the grinding wheel may be brought into contact with the surface to be ground before the automatic feeding mechanism is put into operation. This method of side feed is also well known to those familiar with this class of machines and forms no part of my invention.

A second grinding spindle 37, driven by a pulley and carrying a'grinding wheel 38 for grinding the end I) of the cylinder 8, is carried upon a table 39, arranged to move in ways 40 parallel with the ways 10, in order that the grinding wheel 38 may be set by the screw threaded shaft 41, Fig. 5, operated by a hand wheel 42 in a position to contact with the end of the cylinder 8. Supported on the table 39 is a table 43 forming a support for the spindle 37, which is arranged to receive a reciprocating movement trans verse to that of the table 39, as follows: As shown in Fig. 5, the shaft 21 by which the table 9 is reciprocated" is continued backward and arranged to rotate, through change gears and the usual clutches, a shaft 45. provided with a worm connection with a.

horizontal shaft 46, upon which is slidably mounted a bevel gear 47, arranged to rotate a vertical shaft 48 carrying a pinion 49, which engages a rack 50 upon the under side of the transverse table 43.

The shaft 46 is polygonal in cross section, providmg a sliding connection for the bevel gear 47 to allow for the movement of the table 39 in setting the grinding wheel 38.

The reverse movement of the transverse table43 occurs when the shaft 21 is reversed by the mechanism already described for reversing the movement of the table 9, so that the reciprocating movement of the table 43 'of the table 9.

in either direction'is synchronous with that The relative distance traveled between each simultaneous reverse by the tables 9 and 43 depends,-therefore, entirely upon the relative speed of movement of the respective tables, This is regulated by the change speed gears 44 which consist, in this instance, of three pairs ofintermeshing gears o, d and e. The pair of gears c are arranged to drive the table 43 at the same speed as the table 9, to provide for work in which the surfaces a and b to be ground are of approximately equal length.

The other pairs of gears 'd and e are ar' ranged to drive the table 43 at rates of speed of increasing slowness relative to' the speed of the table 9, in order to provide for work in which the surface to be ground by the grinding wheel 38 is less in length than the surface to be ground. by the grinder 14.

Such a condition appears in the case of the cylinder 8 which I have shown, in the present instance, held by the chuck 7. Two sets of gears 03 and e are arranged to provide for a greater or less disproportion in the length of the surfaces (1 and b to be ground, where, however, the surface I) to be ground by the grinder 38 in both cases is less than the surface a to be ground by the grinder 1(1.

' When the surface I) is greater, the pair of gears c is employed which provide for equal speed, and the grinder 14 is allowed to reclprocate beyondthe shorter surface ,a. In

any case, the dogs 28 are set sq as not to reverse the tables 9 and 43 until the grinding of the longer surface iscomplete, allowing the grinder engaged upon the shorter surface to be out of contact with it during a port-ion of its movement. By thus driving the tables 9 and 43 from the same shaft 21, and connecting the table 43 with the shaft 21 by a calculated arrangement' of change gears, I am enabled to govern the relative length of the reciprocating movement of the grinding wheels 14 and 38, and to adapt such movements to the character and shape of the work to be ground.

I am thus enabled to employ two grinding wheels and grind surfaces at an angle to each other by m arrangement of reciprocating the grin ing tools instead of the work, which is possible by my arrangement of the work supporting means, which are held upon a supporting bridge 3, under which the table 9, carrying the grinding wheel 14, may pass in its reciprocating movement.

I claim,-

1. In a grinding machine, comprising a pair of rotating grinding wheels, a rotatin shaft operatively connected with one of sal grinding wheels to impart a feeding motion thereto, a rotating shaft operatively connected with the other of said grinding wheels to ,impart a feeding motion thereto, a geared connection between said shafts, and means for changing the relative speed of said shafts, whereby the relative feeding movements of said grinding wheels are varied.

2. In a grinding machine, comprising a pair ofgrinding wheels, feeding mechanism for each of said wheels, a geared connection between said feeding mechanisms, means for changing the relative speed of said feeding mechanisms, and means for simultaneously reversing said feeding mechanisms.

3. In a grinding machine, comprising a pair of rotating grinding wheels, a feeding mechanism for each of said grinding wheels, means for reciprocating both of said grinding wheels simultaneously, and means for regulating as desired the relative distance traveled by. each of said grinding wheels during said reciprocating movement.

4. In a grinding machine,'comprising a pair of grinding wheels, a feedin mechanism, consisting of a rack and pinion for each mechanism of said wheels, actuating shafts for each of said rack and pinion mechanisms, and a change gear connection between said actuating shafts.

5. In a grinding mechanism, comprising a pair of grinding wheels, .rotating shafts journaled at an angle to each other operatively connected with said grinding wheels respectively, means for rotating one of said shafts in opposite directions as desired, and means for connecting said shafts, thereby Causing the rotation of both simultaneously in the same direction.

6. In a grinding machine, the combination with a horizontal reciprocating table and a grinder mounted on said table, of a stationary Work supporting bridge arranged to permitsaid table to reciprocate beneath it, means on said bridge for holding the Work, a second horizontal table with a grinder mounted thereon, arranged to reciprocate at 10 an angle to said first reciprocating table, and means for varying the relative length of said reciprocating movements.

Dated this 23rd day of May 1908.

JAMES N. HEALD. Witnesses:

PENELOPE COMBERBAGH, HENRY W001) FOWLER. 

